Title: The issues of QFT in curved spacetime and their relevance for observations

Abstract: Quantum field theory and the standard model of particle physics are the epitomes of success achieved by a collaborative growth between theory and observations. The first encounter between gravity and quantum mechanics occurs when we try to understand quantum fields in curved spacetime at the vicinity of gravitational horizons. In this talk, I will discuss in detail the fundamental issues of QFT in curved spacetime, such as the problem of unitarity and information-loss paradox. Then I will discuss our recently proposed new solution to these problems and discuss the observational relevance in the context of cosmic microwave background and black hole physics.

Based on arXiv: 2403.05587, 2401.08288, 2307.10345, 2305.06046 in collaborations with E. Gaztanaga and J. Marto

The talk will be pedagogical and informative to everyone without much of theoretical background. The talk I presume can potentially create new thoughts in relation to cosmological and astrophysical observations. Please note that this will be a whiteboard talk and so may not be fully accessible for online participants.